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A South to North Migration?

Some researchers now believe that the ice-free corridor was settled in a northerly, rather than a southerly, direction.

Geologic evidence indicates that de-glaciation in the corridor region may have occurred first in the south, so the ice-free corridor actually
opened in a south to north direction. Spear points found at the Charlie Lake Cave site in northern British
Columbia are similar to those found to the south at the earlier sites of Indian Creek and Mill Iron, Montana. This suggests that the tool technology
was developed in the southern part of the continent, before the tool-makers and their descendants moved north. Finally, an analysis of bison remains
found at Charlie Lake Cave revealed that some of the bison at the site were descended from populations that lived south of the ice sheets
(B. bison antiquus).

The dates from Charlie Lake Cave are also earlier then many of the
Clovis sites found in the south, which means that Charlie Lake Cave
is not evidence of an early Clovis migration through the ice-free corridor. These lines of evidence have led some archaeologists to hypothesize
that as the ice-free corridor environment
became viable, herds of bison migrated north through the corridor. They were followed by small groups of hunters whose ancestors had
reached the Great Plains via another, as yet undetermined, route.